An address to parents on the present state of vaccination in this country : with an impartial estimate of the protection which it is calculated to afford against the small-pox / by a candid observer.

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An address to parents on the present state of vaccination in this country : with an impartial estimate of the protection which it is calculated to afford against the small-pox / by a candid observer. Public Domain Mark. Source: Wellcome Collection.

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